Suction pump



April 29, 1930.

w. G. CUMMING SUCTION PUMP Filed March 10. 1928 Z M A L, i 6 l W M M g 3 4 W [4 Mn 2 k 4 R E. 0 1

L 3 2 A 3 o i 3 1 4 M M 4 2 0 L WK E. 0 1

INVENTOR,

WILLIRM Canaan Eummwa sults.

Patented Apr. 29, 1939 UNIT 5* PAT FFICE WILLIAM GORDON CUMMING, OF'MONTREAL, QUEBEC, CANADA, ASSIGNOR TO OUM- MING PUMP CORPORATION LIMITED, OF MONTREAL, CANADA, CORPORATION OF CANADA SUCTION PUMP Application filed March 10, 1928. Serial No. 260,618.

This invention relates to pumps and particularly to those of the disc type adapted to produce and maintain a supply of gas or compressible fluid under pressure in a container.

1 The object of the invention is to provide a.

pump of novel design, simple construction, ready replacement of parts, inexpensive to manufacture, easy to, operate and efficientin operation, which will produce the desired refurther object is to provide a pump in which the residual air at the end of the compression stroke is reduced'to a minimum.

A further object is to provide a pump of the specified type which will function under a variable stroke without afiecting its efliciency.

A further object is to provide a pump in which the heat generated in functioning is dissipated in the material operated on.

In disc and diaphragm pumps as designed up to the present time, the edges of the separable surfaces have been permanently attached and the charge, drawn in when the surfaces were caused to separate, was then discharged through a valved outlet on the return stroke.

Whereas in this invention the surfaces have edges which are free and separable, whereby the charge taken in by the operating stroke, may escape by the entire separation of the edges or may be driven out between the free edges, which form an outlet valve, on the return stroke of the pump, thus avoiding the necessity ofan outlet valve.

Briefly stated, the device consists in a leak proof container, within which are mounted a fixed disc or surface having an inlet valve, preferably at its center, to a tube in the container wall, and a movable disc having flexible and resilient edges, adapted to reciprocate towards and away from the fixed disc or surface, such as a disc mounted on the end of a reciprocating rod, passing through a gland in the container wall and reciprocated by suitable mechanism.

In the following description, one form of means to carryout my invention is set forth, but I do not limit the scope of it to this specifie device as it can be carried out in other modifications and construction.

In the accompanying drawings the invention is illustrated diagrammatically.

Fig. 1 shows the discs in complete contact at one end of the stroke.

Fig. 2 shows one of the discs drawn outwards and a cavity formed.

Fig. 3 shows the discs entirely separated.

Fig. 4 shows one of the discs replaced by a solid surface.

Fig. 5 shows a three way valve.

The container 1, has a cover 10, and a valved outlet 11.

An inlet tube 2, is mounted in thecover 10, or one of the walls of the container 1, and secured to the end projecting into the chamber of the container 1, is ajdisc 40, having a flexible and resilient edge 42, and a surface 41, which is slightly concave. "An inlet valve 20, on the end of the tube 2, opens centrally on the surface 41, of the disc 40.

In the opposite wall of the container 1, a gland 12,-provides a slide way for a reciproeating plunger 3, with a head 30, on which is mounted a disc 4, similar to the disc 40, and adapted to completely contact therewith when the plunger 3, is moved inwards, as shown in Figure 1.

Means to reciprocate the plunger 3, are shown comprising a hand lever 32, pivoted at 33, to a bracket 31,- from the container 1, with a slotted pivotal coupling 34, to the outer end of the plunger 3.

A spring 35, may be mounted on the plunger 3, between the disc 4, and the gland 12, to maintain the discs normally in contact.

In place of employing two similar discs as shown in Figures 1, 2 and 3, one of them may be replaced by a rigid surface, either plane or curved. In Figure 4 is shown an assembly in which a rigid convex surface 43, forming the inner side of the cover 10, takes the place; of the disc 40, in Figures 1, 2 and 3.. It is obvious that the reciprocation. of either thedisc or the surface may take placeand that.

the inlet valve may be ineither of them.

The discs may be entirely of flexibleand re-' silient material such as rubber,-0r may have centers of more rigid .material'with flexible and resilient edges. Ineither case the flexibility and resiliency of the disc edges must be such that on the inward stroke, will permit the edges to be brought into contact while the centers are still slightly separated and subsequently yield while the centers are brought into contact, and that on the outward stroke will maintain theedges in contact while the initial cavity is formed by the separation of the centers, and will subsequently bend andv permitthe edges to be maintained in contact due to the pressure of the air in thecontainer being greater than that in theca'vity.

The operation of the device is as follows Starting with the air in the container under pressure above that of the atmosphere, and the discs in complete contact as. shown in Figural, at the commencement ofthe plun ers outward stroke, the centers of the discs separate and form an initial cavity under vacuum, the edges remain in contact due to their resilience and the normally concave form of the surfaces of the discs. vAs the stroke'continues the flexible edges are maintained in contact by the pressure of the'surrounding air and bend inwardly while still in complete contact. in the cavity between the discs opens the inlet valve and admits a charge of air at non m'al pressure. If the return strokenow starts and the centers of the discs approach each sure in the container.

other, compressing the charge of air in the cavity until it reaches a pressure suflicient to drive it out of the cavity, it passes out between the edges of the discs into the contain- Cer, thereby increasing the air pressure there- 7 in. The inward stroke of the plunger brings the discs again into complete contact and the cycle is repeated so that each reciprocation adds to the air pressure in the container.

If the outer stroke of the plunger continues until the edges of the discs are drawn apart,

the charge of air is released and its compression is effected by the air already under pres- When this takes place, the heat of compression is absorbed and dissipated by the airin the container. Thelocal heating that occurs when the charge. of air is compressed between the discs is in this case eliminated.

The return or inward stroke will then bring the separated discs into complete contact again.

The pump is therefore able to function under a variable length of stroke with high efficiency. V

In order to start the pump in a container with air at normalpressure. three way valve 21, is mounted on. the inlet tube 2, having a branch 22, containing spring operated ball valve 23. When the valve 21, is set to the branch 22, and thediscs are drawn apart at the beginning of the outward stroke; an in- -1-t1al cavity under vacuum is formed between w the d'iscs, which holds until the vacuum overtirely eliminated.

The vacuum created comes the tension of the spring of the ball valve, which then opens and admits a charge of air into the cavity, from which it is expelled on the return stroke. This operation may be continued until the pressure in the container is suflicient to'hold the edges of the discs in contact duringthe formation of the initial cavity between the discs.

In this pump, as the. facesof the discs can be brought. into completecont-a'ct, the presence of residual air between the discs. on the completion of the inward stroke can" be en:

uum in the, cavity of. this pump is not affected by this defect, so common to pumps of this type. r a i I claim: r

.1. In a disc pump, a container, a pair=of saparable discs mounted therein, one of which has a valved inlet, and means to-move one disc to and fromthe other disc. I

2. In a disc pump, a. container, apair of separable resilient discsmounted therein, one

.of which has a valved inlet, and means to move one disc to and from the other disc.-

- 3.. In a disc pump, a container,: a pair of separable discs mounted therein, one of. which has a concaved faceand flexible edges and one of which has a valved inlet, and means to move one disc to and from the other disc.

l. In a d sc. pump, the combination of a contamer with a pair of separable resilient and a reciprocating plunger supporting the other disc, and adapted to move it to and from the first disc. V V l 5. In a disc pump, the combination of a container with a pair ,of' separable resilient discs, a valved inlet stem supporting one of the discs, a plunger mountedin a gl an'dj sup porting the other disc, and means to reciprocate the plunger adapted to draw the discs apart and to bring them together.

6. In a disc pump, the combination of a container with a pair of separable discs, onethe discs, a plunger mounted in a gland sup' porting the other disc, and means to recipro cate the plunger and a spring'mountedithereon adapted'to bring the discs together.

8. In a disc pump,.a container, a disc and a member having cooperating surfacesfmounte'd therein, one of which" has a valved inlet,

and means to move the disc to and from the surface of the member. i 1

9. In a disc pump, a container, a-disc'with flexible edges and a member havingmooperating surfaces, mounted therein, one of which The formation of the vac' discs, a valved inlet stem supporting one disc has a valved inlet, and means to move the disc to and from the surface of the member.

10. In a disc pump, a container, a resilient disc and a member having cooperating surfaces, mounted therein, one of which has a valved inlet, and means to move the disc to and from the surface of the member.

11. In a disc pump, a container, a disc with a concaved face and flexible and resilient edges and a member having cooperating surfaces, mounted therein, one of which has a valved inlet and means to move the disc to and from the surface of the member.

12. In a disc pump, the combination with a container of a disc and a member having cooperating surfaces, means for reciprocating the disc relatively to the surface, said disc having a free flexible edge adapted to engage with the surface and an inlet valve communicating with the cavity formed between the disc and the surface.

13. In a compression pump, a container, a pair of flexible discs mounted therein having contactable surfaces, a valved inlet to one of the discs, and means to reciprocate one of the discs relatively to the other disc.

14. In a compression pump, a container, a concaved flexible disc and a surface contact" able thereto mounted within the container, a valved inlet to the center of contact, and means to reciprocate the disc relatively to the surface.

15. In a compression pump, a container, means within and independent of the container to draw air therein, means to release the air from said means prior to compression, whereby the released air is compressed by the air in the container.

WILLIAM GORDON OUMMING. 

